https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-8047 Lustre <p>When investigating performance issues with <a href="https://jira.whamcloud.com/browse/LU-4398" title="mdt_object_open_lock() may not flush conflicting handles" class="issue-link" data-issue-key="LU-4398"><del>LU-4398</del></a>, we've found that if the MDS does not return a lock for an open request, ll_md_blocking_ast() will be called for a failed UPDATE lock on the corresponding directory. ll_invalidate_negative_children() will process the whole cache associated with the directory in order to find negative entries and invalidate them.</p> <p>If a directory has millions of cached dentries, ll_invalidate_negative_children() spends several scheduler ticks just to process the list. There is clearly some room for ll_invalidate_negative_children() optimization, but we'd like to optimize at least ll_md_blocking_ast() to avoid processing for not granted locks.</p> <p>A patch will be uploaded shortly.</p> LU-8047

optimize ll_md_blocking_ast() for a failed lock

Bug Minor Resolved Fixed Andrew Perepechko Andrew Perepechko patch Wed, 20 Apr 2016 09:17:49 +0000 Fri, 21 Jun 2019 18:32:30 +0000 Thu, 21 Mar 2019 04:54:44 +0000 Lustre 2.9.0 Lustre 2.13.0 Lustre 2.12.3 0 9 <p>Andrew Perepechko (andrew.perepechko@seagate.com) uploaded a new patch: <a href="http://review.whamcloud.com/19665" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/19665</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-8047" title="optimize ll_md_blocking_ast() for a failed lock" class="issue-link" data-issue-key="LU-8047"><del>LU-8047</del></a> llite: optimizations for not granted lock processing<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: 18b15ab0fe7cd2157aee1e3dcef019c77ef61a53</p> <p>The attached patch looked good but was not landed at the end. Any news on this front?</p> <p>Oleg Drokin (green@whamcloud.com) merged in patch <a href="https://review.whamcloud.com/19665/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/19665/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-8047" title="optimize ll_md_blocking_ast() for a failed lock" class="issue-link" data-issue-key="LU-8047"><del>LU-8047</del></a> llite: optimizations for not granted lock processing<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: <br/> Commit: 2c126c5a73edea434456c6c335772daaac717f2f</p> <p>Landed for 2.13</p> <p>Minh Diep (mdiep@whamcloud.com) uploaded a new patch: <a href="https://review.whamcloud.com/35001" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/35001</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-8047" title="optimize ll_md_blocking_ast() for a failed lock" class="issue-link" data-issue-key="LU-8047"><del>LU-8047</del></a> llite: optimizations for not granted lock processing<br/> Project: fs/lustre-release<br/> Branch: b2_12<br/> Current Patch Set: 1<br/> Commit: 52020b50d419b05028c874fb7681060a2ef06f0d</p> <p>Oleg Drokin (green@whamcloud.com) merged in patch <a href="https://review.whamcloud.com/35001/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/35001/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-8047" title="optimize ll_md_blocking_ast() for a failed lock" class="issue-link" data-issue-key="LU-8047"><del>LU-8047</del></a> llite: optimizations for not granted lock processing<br/> Project: fs/lustre-release<br/> Branch: b2_12<br/> Current Patch Set: <br/> Commit: d543393c7b99ee8482e4cbda36dfe4f54aa15bb6</p> Related Development Rank 1|hzy8o7: Rank (Obsolete) 9223372036854775807 Severity